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Change import statements to import only what's needed #468

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@denisra denisra commented Nov 16, 2016

Changed all the import statements in all modules in the examples directory to import only what is needed.

This fixes issue #464

directory to import only what is needed.

This fix issue python#464
@1st1
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1st1 commented Nov 16, 2016

How about we do simple

import asyncio

at the top of each example? get_event_loop() should become asyncio.get_event_loop().

That's the style we recommend in Python documentation and use in asyncio code itself.

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denisra commented Nov 16, 2016

That makes sense. Let me fix that.

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denisra commented Nov 16, 2016

@1st1 Please let me know if you need me to change anything else.

@the-knights-who-say-ni This is my first contribution. I've just created my account at bugs.python.org and added my Github username to it. Please let me know if I missed anything.

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Please ignore any label fiddling I do; you managed to find a bug with the @the-knights-who-say-ni bot.

@denisra do make sure to sign the CLA.

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OK, bot is fixed; sorry about that.

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In terms of imports you need to be careful about side-effect access to submodule that just happen to be imported from asyncio itself, e.g. don't rely on test_utils existing on asyncio.

@@ -172,7 +173,7 @@ def main():
loop = asyncio.new_event_loop()
sslctx = None
if args.tls:
sslctx = test_utils.dummy_ssl_context()
sslctx = asyncio.test_utils.dummy_ssl_context()
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Unless it's documented as such, there's no guarantee this will hold in the future. It would be better to import asyncio.test_utils explicitly.

@@ -3,8 +3,7 @@
import argparse
import sys

from asyncio import *
from asyncio import test_utils
import asyncio
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Also import asyncio.test_utils.

@@ -3,8 +3,8 @@
import argparse
import sys

from asyncio import *
from asyncio import test_utils
import asyncio
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asyncio.test_utils

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I wonder why we use test_utils anyways. It should be removed from examples.

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@brettcannon Thanks for pointing that out. I made the changes as suggested. Please let me know if I need to change anything else.

@denisra
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denisra commented Nov 17, 2016

@brettcannon I can also confirm that I've signed the CLA.

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1st1 commented Nov 17, 2016

@denisra I wonder if we could remove import asyncio.test_utils completely. This is an internal module, and has nothing to do with examples (which historically were just experiments with asyncio, while asyncio was in active development).

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denisra commented Nov 17, 2016

@1st1 is it ok if I create another issue and submit another PR for that, to keep things separated?

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1st1 commented Nov 17, 2016

@1st1 is it ok if I create another issue and submit another PR for that, to keep things separated?

OK, let's do that!

import json
import logging

import asyncio
import asyncio.test_utils

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Imports should be sorted alphabetically (that's what we try to do in asyncio and CPython code bases).

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@1st1 I wasn't aware of that, sorry. I was going by the PEP8 guidelines, where it tells us to import the standard library modules first. But I'll have that fix following your recommendations.

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@denisra Asyncio is technically a stdlib module. ;)

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@SethMichaelLarson I can't say that it isn't :) will send send in another commit in just a few min with that fixed

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5 participants